The basic principle is that the wood should not contribute to fire, and should ensure minimal energy and smoke development. The wood as such never becomes noncombustible, this is not possible. This is important to understand because there are operators who claim that their fire protection makes the wood noncombustible (type A2-s1, d0) which is completely impossible when wood is combustible, not noncombustible.
Fire is a phenomenon that occurs when a gas undergoes an exothermic reaction involving combustion of a combustible, in this case the wood. The combustion that occurs in the contact area is greatly reduced when Woodsafe PRO™ or Woodsafe Exterior WFX™ is activated via the occuring heat. The chain reaction that starts in the fire protection forms water that lowers the temperature of the contact surface and carbon dioxide that consumes the combustible pyrolysis gases that occur. As a consequence, the wood as such will only become decoloured (as if it were soaked) and not contribute to the spread of fire.
To compare Woodsafe and fire protection paint, fire protection paint or fire protection varnish does not improve or alter the wood's ability to burn. Wood products painted with fire protection paint still have property D-s2, d0, but there is thus a paint layer with property B-s1, d0. The crucial difference is that Woodsafe is ALL-IN-ONE B-s1, d0 while fire-painted wood panelling is B-s1,d0/D-s2,d0.
- ALL IN ONE Fire protection
- The wood has fire protection B-s1, d0
- Does not generate a coating
- Preserves structure, feeling and shade
- Tough usage e.g. corridors, gyms
FIRE-RESISTANT PAINT VARNISH
- Generates a coating B-s1, d0
- The wood is still D-s2, d0
- Affects structure, feeling and shade
- Sensitive to natural movement of the wood
- Sensitive to wear and tear